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The combustion of liquid ethanol (C2H5OH) produces carbon dioxide and water. After 3.8

Chapter 8, Problem 92P

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QUESTION:

The combustion of liquid ethanol (\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)) produces carbon dioxide and water. After 3.8 mL of ethanol (density = 0.789 g/mL) is allowed to burn in the presence of 12.5 g of oxygen gas, 3.10 mL of water (density = 1.00 g/mL) is collected. Determine the limiting reactant, theoretical yield of \(\mathrm{H}_{2} \mathrm{O}\), and percent yield for the reaction. (Hint: Write a balanced equation for the combustion of ethanol.)

Equation Transcription:

Text Transcription:

C_2 H_5 OH

H_2 O

Questions & Answers

QUESTION:

The combustion of liquid ethanol (\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)) produces carbon dioxide and water. After 3.8 mL of ethanol (density = 0.789 g/mL) is allowed to burn in the presence of 12.5 g of oxygen gas, 3.10 mL of water (density = 1.00 g/mL) is collected. Determine the limiting reactant, theoretical yield of \(\mathrm{H}_{2} \mathrm{O}\), and percent yield for the reaction. (Hint: Write a balanced equation for the combustion of ethanol.)

Equation Transcription:

Text Transcription:

C_2 H_5 OH

H_2 O

ANSWER:

Step 1 of 5

Given that initial volume of ethanol is 3.8 mL and density is 0.789 g/mL

Mass = density volume = 3.8 mL  0.789 g/mL = 2.99 g

Number of moles of ethanol = Given mass/Molecular mass

Molecular mass of ethanol= 46 g/mol

Thus number of moles of ethanol =  = 0.06 moles

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